@article{EnglischBarberkaPietschetal.1995, author = {Englisch, Uwe and Barberka, Thomas Andreas and Pietsch, Ullrich and H{\"o}hne, U.}, title = {Investigation of the chain-chain interface in a lead-stearate multilayer using neutron reflectivity}, year = {1995}, language = {en} } @article{ReichePenacoradaGeueetal.1995, author = {Reiche, J{\"u}rgen and Penacorada, Florencio and Geue, Thomas and Pietsch, Ullrich and Brehmer, Ludwig}, title = {In-plane structure of uranylarachidate multilayers}, year = {1995}, language = {en} } @article{StahnMoehlePietsch1996, author = {Stahn, Jochen and M{\"o}hle, Marcus and Pietsch, Ullrich}, title = {Accurate structure determination for GaAs using Pendell{\"o}sung oscillation}, year = {1996}, language = {en} } @article{PietschHansen1996, author = {Pietsch, Ullrich and Hansen, N. K.}, title = {A critical review of the valence charge density in GaAs}, year = {1996}, language = {en} } @article{LichanotAzavantPietsch1996, author = {Lichanot, Albert and Azavant, P. and Pietsch, Ullrich}, title = {Ab-initio Hartree-Fock study of the electronic charge density of the cubic boron nitride and its comparison with the experiment}, year = {1996}, language = {en} } @article{ReicheKnochenhauerDieteletal.1997, author = {Reiche, J{\"u}rgen and Knochenhauer, Gerald and Dietel, Reinhard and Freydank, Anke-Christine and Zetzsche, Thomas and Pietsch, Ullrich and Brehmer, Ludwig and Barberka, Thomas Andreas and Geue, Thomas}, title = {Structure of thermally treated oxadiazoleamide Langmuir-Blodgett films}, year = {1997}, abstract = {The thermal treatment of Y-type Langmuir-Blodgett (LB) films formed from the amphiphilic derivative of 2,5- diphenyl-1,3,4-oxadiazole 1 results in changes of the molecular packing. These changes have been analysed by a combination of X-ray specular reflectivity data, X-ray grazing incidence diffraction data and scanning force microscopy images, On the basis of these experimental data we have simulated possible supramolecular structures, These simulations provide insight into the intermolecular interactions giving rise to the observed structural transitions. The crystalline structure induced by thermal treatment of the LB films is characterized by a uniaxial texture, which is correlated with the dipping direction during deposition of the LB film.}, language = {en} } @article{ReichePenacoradaGeueetal.1997, author = {Reiche, J{\"u}rgen and Penacorada, Florencio and Geue, Thomas and Pietsch, Ullrich and Brehmer, Ludwig}, title = {Monolayers and multilayers of uranyl arachidate : in-plane structure of uranyl arachidate multilayers}, year = {1997}, abstract = {The molecular in-plane structure of uranyl arachidate Langmuir-Blodgett (LB) films formed at different subphase pH values was analysed by means of X-ray grazing-incidence diffraction. For multilayers formed at low subphase pH a reorganisation of the arachidic acid film structure is confirmed. At appropriate subphase pH values, reorganisation of the film structure, e.g. via the formation of three-dimensional crystallites, is prevented by the presence of the uranyl ions and by the subsequent introduction of conformational disorder (gauche defects) in the alkyl chains. The observation of a macroscopic flow-induced in-plane texture in these uranyl arachidate LB films has profound implications for the design of ordered, supramolecular structures by the Langmuir-Blodgett technique.}, language = {en} } @article{PietschBarberkaGeueetal.1997, author = {Pietsch, Ullrich and Barberka, Thomas Andreas and Geue, Thomas and St{\"o}mmer, Ralph}, title = {X-ray scattering from thin organic films and multilayers}, year = {1997}, language = {en} } @article{EnglischGutberletSeitzetal.1997, author = {Englisch, Uwe and Gutberlet, T. and Seitz, R. and Oeser, R. and Pietsch, Ullrich}, title = {Thermally induced rearrangement of fatty acid salt molecules in Langmuir-Blodgett multilayers}, year = {1997}, language = {en} } @article{DarowskiPaschkePietschetal.1997, author = {Darowski, Nora and Paschke, K. and Pietsch, Ullrich and Wang, K. H. and Forchel, Alfred and Baumbach, Tilo and Zeimer, Ute}, title = {Identification of a buried single quantum well within surface structurized semiconductors using depth resolved x-ray grazing-incidence diffraction}, year = {1997}, language = {en} }